My previously good sleeper DD is just 2.5, her little sister is 9 months. The baby has just started sleeping through after various illnesses. However for last 2 months DDs sleep has got worse & worse and last night she was up 10 times between 2&4, she comes to her bedroom gate, shouts for us then when we come goes straight back to bed with no explanation. We just tuck her back in, some nights it only happens a couple of times but sometimes it's multiple...anyone have any experience or advice... Please! Thank you